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"This seems to have stemmed from, as silly as this sounds, a sports competition between two schools, and it kind of got blown out way out of proportion in someone's mind and someone's action," Monterey County Sheriff's Cmdr. John Thornburg said.

Monterey County Sheriff's Department investigators believe a student from Pacific Grove High School was involved in the threat.

Thornburg said a historical rivalry between the two resulted in the bomb threat issued over social media.

"I think that's what it was, a rivalry thing. (The student) just legitimately got mad at somebody and decided to write something in a fit of anger or just thought it would be funny. It was not received this way. It was not treated that way by the sheriff's office," Thornburg said.

Deputies searched the school Sunday and Monday but found nothing suspicious and do not believe the threat is credible.

"In this threat, bombs were mentioned or alluded to. We found no evidence that a bomb was being made or that anybody had the capacity to make one, present one, bring one to the school, make any arrangements for that to happen. There was nothing to say that led us to believe that anything would happen," Thornburg said.

Like any threat, the district and sheriff's department took it seriously.

Four deputies patrolled the school all day Monday. Though law enforcement have deemed the threat harmless, the principal thought it better to be safe than sorry.

"It's one of those situations where we don't want any perceived threats to go unchecked so we want to be in a position of an abundance of safety and tale a solid, hard look at what's going on on campus," Carmel High School principal Rick Lopez said.

Deputies will not be at the high school overnight because they do not believe there is an imminent threat. They have not decided whether they will have a presence at the school Tuesday.